NORTH WEST WATER GROUP PLC

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5847075 Polymer and porous structureExpiredOct 02, 95Dec 08, 98[C08G, B01D]
5698105 Polymer porous structure and processExpiredOct 11, 95Dec 16, 97[B01D]
5605628 Composite membranesExpiredDec 06, 94Feb 25, 97[B01D]
5549829 Membrane filtration systemExpiredMay 22, 95Aug 27, 96[B01D]
5376442 Composite membranesExpiredMar 24, 93Dec 27, 94[B01D, B32B]
5232598 Porous inorganic membranesExpiredJun 10, 92Aug 03, 93[E01D]
5118766 Process of preparing polymer sulphonyl derivativesExpiredJul 24, 89Jun 02, 92[C08G, C08F]
5112892 Method for the production of an asymmetric semipermeable membrane from a solution of a sulfonated polyarylethersulfoneExpiredSep 06, 90May 12, 92[C08J, C08L, C08K]
5049642 Aromatic polymersExpiredDec 21, 89Sep 17, 91[G01J, C08G]
5030672 MembranesExpiredOct 01, 90Jul 09, 91[C08V, C08L]
5008352 Substituted aromatic polymersExpiredFeb 08, 89Apr 16, 91[C08G]
4977015 Films and tapesExpiredDec 22, 89Dec 11, 90[B32B]
4935139 Composite membranesExpiredMay 22, 89Jun 19, 90[B01D]
4919992 Process for making microporous products and the products thereofExpiredJul 01, 88Apr 24, 90[B32B]
4919996 Films and tapesExpiredMar 11, 88Apr 24, 90[D03D]
4419486 Sulphonated polyaryletherketonesExpiredMay 26, 81Dec 06, 83[C08G]
4273903 Sulphonated polyarylethersulphone copolymersExpiredAug 21, 79Jun 16, 81[C08G]
4268650 Sulphonated polyaryletherketonesExpiredAug 21, 79May 19, 81[C08G]

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